Update Docs for Work Order (#13403)

* update docs

* rename files, update pngs

* update pngs for timesheet, leftover changes
diff --git a/erpnext/public/js/help_links.js b/erpnext/public/js/help_links.js
index 21d02db..e812f19 100644
--- a/erpnext/public/js/help_links.js
+++ b/erpnext/public/js/help_links.js
@@ -493,7 +493,7 @@
 ]
 
 frappe.help.help_links['Form/Work Order'] = [
-	{ label: 'Work Order', url: 'https://frappe.github.io/erpnext/user/manual/en/manufacturing/production-order' },
+	{ label: 'Work Order', url: 'https://frappe.github.io/erpnext/user/manual/en/manufacturing/work-order' },
 ]
 
 frappe.help.help_links['Form/Workstation'] = [